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2 December, 02:02

Fill up the blank : - Mantle cavities, tracheal tubes, and book lungs are all types of respiratory structures in ...

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  1. 2 December, 02:04
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    Mantle cavities, tracheal tubes, and book lungs are all types of respiratory structures in terrestrial invertebrates. This is true while several aquatic animals living underwater exchange gases and live through a common part called gills. Terrestrial animals in general should keep their respiratory membranes moist.
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